WO2016107071A1 - 显示装置 - Google Patents

显示装置 Download PDF

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Publication number
WO2016107071A1
WO2016107071A1 PCT/CN2015/080664 CN2015080664W WO2016107071A1 WO 2016107071 A1 WO2016107071 A1 WO 2016107071A1 CN 2015080664 W CN2015080664 W CN 2015080664W WO 2016107071 A1 WO2016107071 A1 WO 2016107071A1
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WO
WIPO (PCT)
Prior art keywords
light
area
display panel
emitting
flexible display
Prior art date
Application number
PCT/CN2015/080664
Other languages
English (en)
French (fr)
Inventor
王欢
辛武根
涂志中
尹傛俊
Original Assignee
京东方科技集团股份有限公司
合肥鑫晟光电科技有限公司
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 京东方科技集团股份有限公司, 合肥鑫晟光电科技有限公司 filed Critical 京东方科技集团股份有限公司
Priority to US14/894,672 priority Critical patent/US9886914B2/en
Priority to EP15794810.0A priority patent/EP3242283A4/en
Publication of WO2016107071A1 publication Critical patent/WO2016107071A1/zh

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    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09F—DISPLAYING; ADVERTISING; SIGNS; LABELS OR NAME-PLATES; SEALS
    • G09F9/00—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements
    • G09F9/30—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements in which the desired character or characters are formed by combining individual elements
    • G09F9/35—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements in which the desired character or characters are formed by combining individual elements being liquid crystals
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/03—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes specially adapted for displays having non-planar surfaces, e.g. curved displays
    • G09G3/035—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes specially adapted for displays having non-planar surfaces, e.g. curved displays for flexible display surfaces
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09F—DISPLAYING; ADVERTISING; SIGNS; LABELS OR NAME-PLATES; SEALS
    • G09F9/00—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements
    • G09F9/30—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements in which the desired character or characters are formed by combining individual elements
    • G09F9/301—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements in which the desired character or characters are formed by combining individual elements flexible foldable or roll-able electronic displays, e.g. thin LCD, OLED
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/006—Electronic inspection or testing of displays and display drivers, e.g. of LED or LCD displays
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
    • G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
    • G09G3/3406—Control of illumination source
    • G09G3/342—Control of illumination source using several illumination sources separately controlled corresponding to different display panel areas, e.g. along one dimension such as lines
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
    • G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
    • G09G3/36—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source using liquid crystals
    • G09G3/3611—Control of matrices with row and column drivers
    • G09G3/3622—Control of matrices with row and column drivers using a passive matrix
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
    • G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
    • G09G3/36—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source using liquid crystals
    • G09G3/3611—Control of matrices with row and column drivers
    • G09G3/3648—Control of matrices with row and column drivers using an active matrix
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2300/00—Aspects of the constitution of display devices
    • G09G2300/04—Structural and physical details of display devices
    • G09G2300/0469—Details of the physics of pixel operation
    • G09G2300/0478—Details of the physics of pixel operation related to liquid crystal pixels
    • G09G2300/0482—Use of memory effects in nematic liquid crystals
    • G09G2300/0486—Cholesteric liquid crystals, including chiral-nematic liquid crystals, with transitions between focal conic, planar, and homeotropic states
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2320/00—Control of display operating conditions
    • G09G2320/04—Maintaining the quality of display appearance
    • G09G2320/041—Temperature compensation
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2320/00—Control of display operating conditions
    • G09G2320/04—Maintaining the quality of display appearance
    • G09G2320/043—Preventing or counteracting the effects of ageing
    • G09G2320/046—Dealing with screen burn-in prevention or compensation of the effects thereof
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2330/00—Aspects of power supply; Aspects of display protection and defect management
    • G09G2330/04—Display protection
    • G09G2330/045—Protection against panel overheating
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2360/00—Aspects of the architecture of display systems
    • G09G2360/14—Detecting light within display terminals, e.g. using a single or a plurality of photosensors
    • G09G2360/145—Detecting light within display terminals, e.g. using a single or a plurality of photosensors the light originating from the display screen

Definitions

  • the present invention relates to a display device.
  • the current so-called "hard” display device is mainly an LCD (Liquid Crystal Display).
  • LCD Liquid Crystal Display
  • Such a display screen inevitably has a certain weight and volume, is not bendable, and needs to be placed in a fixed frame, and its use convenience is limited.
  • the core component of the flexible display device is a flexible display panel.
  • a flexible display panel refers to a display panel that has flexibility in forming a display unit on a flexible substrate such as polyimide. Because the flexible display panel has the characteristics of being light and thin, bendable and low in power consumption, and the deformation makes the volume smaller and portable, it has great application potential.
  • Existing flexible display panels generally include a housing and a panel that is crimped within the housing, and one end of the panel is pulled out of the housing for viewing.
  • the flexible display panel only needs to pull a portion out of the housing. Since all the display areas of the flexible display panel are still in an effective display state at this time, the flexible display panel portion which is still in the curled state inside the casing is also in an effective display state. In this case, since the panel located inside the casing is in a curled state, the curled flexible panel in the effective display state causes a heat accumulation problem inside the casing, resulting in a high internal temperature of the casing. If the panel is exposed to high temperatures for a long time, the performance of the panel is reduced, thereby shortening the service life of the panel.
  • the invention provides a display device capable of improving the service life of a flexible display panel.
  • an embodiment of the invention is a display device.
  • the device includes: a casing, an outlet is disposed on the casing; a flexible display panel inside the casing, at least a part of the flexible display panel can be pulled out from the outlet, and the flexible display panel is pulled out
  • the area outside the housing is a front end area of the flexible display panel, and the area inside the housing is a rear end area of the flexible display panel, from the front end area to the rear end area a direction of extension of the flexible display panel from front to back; a detection calculation unit configured to detect, calculate, and output an area of the front end region; a controller, and the detection calculation unit and the flexible display panel pass Signal connection And receiving the area of the front end area output by the detection calculation unit, and controlling to display only the front end area.
  • the flexible display panel includes at least one separate identification area disposed in a front-to-back direction of the flexible display panel;
  • the detection calculation unit includes a detection unit disposed at the outlet, and The detection calculation unit determines the area of the front end area according to the number of detection areas detected by the detection unit.
  • the plurality of identification regions are at least one light-emitting region formed on the flexible display panel controlled by the controller, the light-emitting region and the number of non-light-emitting regions separating the light-emitting regions And at least three; the detecting unit is a light intensity detecting unit, and the light intensity detecting unit is configured to detect the intensity of light.
  • the detection calculation unit determines that the flexible display panel area in front of the Nth illumination area is the front end area, and feeds back the area information of the front end area to the a controller; when the Nth non-light-emitting area is facing the light intensity detecting unit, the light intensity detecting unit detects an optical signal corresponding to the Nth non-light-emitting area, the detecting and calculating unit Determining that the Nth non-light-emitting area is located at the exit, the detection calculation unit keeps the area information of the front-end area detected last time unchanged; N is a positive integer.
  • the width of the light emitting region is equal to the width of the non-light emitting region in a front to back direction of the flexible display panel.
  • the width of the light-emitting area when the sum of the width of the light-emitting area to be joined and the width of the non-light-emitting area is a fixed value Less than the width of the non-light emitting region.
  • the area where the flexible display panel is first pulled out from the outlet is a light-emitting area.
  • the flexible display panel is an active light emitting type flexible display panel or a passive light emitting type flexible display panel.
  • the flexible display panel is a passive illumination type flexible display panel
  • the display device further includes a light source disposed near the light intensity detecting unit, and the light emitted by the light source does not directly enter the light intensity detecting unit.
  • the light emitting region reflects light from the light source, and the non-light emitting region transmits light from the light source.
  • the flexible display panel is a passive matrix flexible display surface that is scanned column by column. board.
  • the probe computing unit is located inside the housing and the controller is located external to the housing.
  • the controller when the sounding calculation unit determines that the flexible display panel region in front of the Nth light emitting region is the front end region, the controller further controls the Nth located behind the Nth light emitting region. +1 of the illuminating regions emit light.
  • the controller is configured to control up to two illumination zones to be in a light emitting state.
  • the controller is configured to control only the Nth illumination area when the detection calculation unit determines that the flexible display panel area in front of the Nth illumination area is the front end area And emitting an N+1th of the light-emitting regions located behind the Nth light-emitting region.
  • the controller is configured to control all of the light emitting regions on the flexible display panel to be in a lighted state when the display device is first powered.
  • the detection calculation unit can detect the area size of the front end region of the display panel located outside the casing, and feed back the area information corresponding to the detected front end region to the controller.
  • the controller can control only the front end area display screen of the display panel according to the information, and control the rear end area of the display panel to maintain the original state, that is, the screen is not displayed, so that the temperature of the back end area is low, and the generated heat is small. Therefore, the temperature inside the casing is low, and therefore, the performance of the panel is not affected or less affected, and the life of the panel is long.
  • the display device has a non-screen display area because the rear end area of the display panel located in the casing is low, the heat generated in the area is low, and the heat inside the casing is small. Also lower. Therefore, the rear end region of the display panel is curled inside the casing, and thermal accumulation does not occur, and the performance of the panel is not reduced by the thermal accumulation phenomenon, and the service life of the display panel is prolonged.
  • FIG. 1 is a schematic diagram of a display device according to an embodiment of the present invention.
  • FIG. 2A-2C are schematic diagrams showing a configuration state of the display device provided in FIG. 1;
  • FIG. 3 is a schematic view showing a configuration state of the display device provided in FIG. 1;
  • FIG. 4 is a schematic view showing a configuration state of the display device provided in FIG. 1;
  • FIG. 5 is a schematic diagram of another display device according to an embodiment of the present invention.
  • FIG. 6 and FIG. 7 are schematic diagrams showing a configuration state of a display device according to an embodiment of the present invention.
  • FIG. 8 is a schematic diagram showing a state transition of a cholesteric liquid crystal in a cholesteric liquid crystal display panel under different applied pressure in a case where the display panel in the display device is a cholesteric liquid crystal display panel.
  • FIG. 1 is a display device according to a first embodiment of the present invention.
  • the display device includes a housing 01 and a flexible display panel 02 located inside the housing 01.
  • the housing 01 can be a box having a different geometry, and the housing can be provided with a vented opening.
  • the flexible display panel 02 is a display panel that is formed on a flexible substrate and can undergo curl deformation while still achieving a display function.
  • the flexible display panel 02 is in a wound state in a state of not being used.
  • An outlet 06 is provided on the housing 01. In the state of use, the display panel 02 is pulled out from the exit 06. As shown in FIG. 1, a portion of the flexible display panel 02 is pulled out from the housing 01.
  • the area outside the casing 02 is the front end area 02a of the flexible display panel 02
  • the area inside the casing 01 is the rear end area 02b of the flexible display panel 02, extending from the front end area 02a to the rear end area 02b.
  • the direction is the front to back direction of the flexible display panel.
  • Front and rear area 02a The opposite end of the end region 02b is connected to the cover 08.
  • the direction in which the flexible display panel 02 is pulled out is the longitudinal direction of the display panel 02, that is, the row direction, and the direction perpendicular to the pull-out direction is the width direction of the display panel 02, that is, the column direction.
  • the above display device further includes a detection calculation unit 03 and a controller 04.
  • the probe calculation unit 03 detects and calculates the area size of the front end area 02a, and outputs the area size of the front end area 02a to the controller 04.
  • the controller 04 is connected to the detection calculation unit 03 and the display panel 02 by a signal, receives the area size of the front end area 02a output by the detection calculation unit 03, and controls to display only the front end area 02a in an effective display state, that is, a display screen.
  • the detection calculation unit 03 can detect the area size of the front end region 02a of the flexible display panel 02 located outside the casing 01, and the area information corresponding to the detected front end region 02a. Output to controller 03.
  • the controller 03 controls only the display screen of the front end area 02a of the flexible display panel 02 based on the information, and controls the rear end area 02b of the flexible display panel 02 to be in a state where the screen is not displayed.
  • the temperature of the rear end region 02b is low, and the amount of heat generated is small, so that the temperature inside the casing 01 is low. Therefore, the performance of the flexible display panel 02 is not affected or less affected, and the flexible display panel 02 has a long service life.
  • the screen is not displayed due to its rear end region of the flexible display panel 02 located inside the casing, the temperature of the region is low, the amount of heat generated is small, and the temperature inside the casing is also low. Therefore, even if the rear end region of the flexible display panel is curled inside the casing, heat accumulation does not occur. The performance of the flexible display panel is not reduced by the thermal accumulation phenomenon, and the service life of the flexible display panel is prolonged.
  • the controller is signally coupled to the probe computing unit and the display panel.
  • signal connection includes connection through a signal line and connection through a wireless signal.
  • the controller is controlled to form a display on the display panel at intervals spaced from the front end region to the rear end region for signal detection.
  • Identification areas eg, illuminating areas
  • non-identifying areas eg, non-illuminating areas
  • the sum of the number of the identification area and the non-identification area is at least three. That is, in the embodiment, the light-emitting area formed on the display panel is used as the identification area, so that the detection calculation unit determines the area size of the front-end area by detecting the light-emitting area.
  • the size of the area of the front end area is mainly determined by the number of light emitting areas detected by the detection calculation unit.
  • the light-emitting area in this embodiment is used for detecting the calculation unit for signal detection, and does not perform normal screen display.
  • the light-emitting area in this embodiment includes an active light-emitting area, and A reflective light-emitting region that passively emits light under illumination from a light source.
  • the non-light-emitting region in the embodiment includes a non-light-emitting region that separates the active light-emitting region, and a light-transmitting region that is separated from the passive light-emitting reflective light-emitting region.
  • the detection calculation unit determines the area of the front end area by detecting the number of light-emitting areas.
  • the non-light-emitting area divides the light-emitting area such that the light-emitting area becomes a plurality of discrete areas spaced apart by a predetermined distance.
  • the detection calculation unit 03 includes a light intensity detecting unit (not shown) provided at the exit 06.
  • the light intensity detecting unit detects the intensity of the light.
  • the light intensity detecting unit may be located inside the housing 01 or outside the housing 01.
  • the light intensity detecting unit detects the light signal of the light-emitting area 07, whereby the sounding detecting unit 03 determines that the light-emitting area 07 is located at the exit 06.
  • the detection calculation unit 03 determines that the display surface area in front of the light-emitting area 07 is the front end area. At this time, the front end region does not include the light emitting region 07 itself. The area information of the front end area is fed back to the controller (not shown).
  • the light intensity detecting unit detects the light signal corresponding to the non-light-emitting area
  • This probe calculation unit 03 holds the area information of the front end region that was last detected unchanged.
  • the light-emitting area may be disposed as a plurality of discrete areas spaced apart by a predetermined distance, that is, the flexible display panel 02 includes a plurality of light-emitting areas 07 with different positions to facilitate distinguishing the front end area of the display panel that is pulled out of the housing 01. Different sizes of 02a.
  • the light-emitting areas 07 at different positions on the flexible display panel 02 indicate front-end areas 02a of different sizes, and the front-end areas 02a of different sizes then correspond to the area information of the different front-end areas 02a.
  • the detection calculation unit 03 acquires different front end area area information by detecting illumination areas located at different positions on the display panel.
  • the detection calculation unit 03 After each detection, the detection calculation unit 03 outputs the area information of the front end area 02a to the controller; and each time the controller receives the area information from the front end area 02a of the detection calculation unit 03, it according to the different front end area 02a
  • the area information controls the pixel display screen in the corresponding front end area 02a.
  • the front end area 02a can display a partial picture in which the full picture or the full picture is scaled down; at the same time, the controller controls the back end area 02b to maintain the original state, that is, the picture is not displayed.
  • the rear end region 02a which is the non-screen display area has a low temperature, and generates little heat, so that the temperature inside the casing 01 is also low.
  • the width of the light-emitting area 07 is equal to the width of the non-light-emitting area in the direction in which the flexible display panel is pulled out.
  • the flexible display panel 02 is removed from the housing due to space constraints.
  • a light-emitting area 07 on the flexible display panel 02 is located outside the casing 01.
  • the non-light-emitting area immediately adjacent to the light-emitting area 07 is located at the exit 06 and is opposite to the light intensity detecting unit.
  • the light intensity detecting unit detects an optical signal corresponding to the non-light emitting area.
  • the detection calculation unit 03 keeps the area information of the front end area detected last time unchanged, that is, the controller does not control to refresh the effective display area of the enlarged front end area 02a at this time.
  • the light-emitting area 07 located outside the casing 01 and closest to the exit 06 does not display a picture.
  • the width of the light-emitting area 07 which does not display the picture should be made as small as possible.
  • the light-emitting area 07 is made. The width is smaller than the width of the non-light-emitting area.
  • the flexible display panel 02 is disposed such that the area first pulled out from the outlet 06 is a non-light-emitting area, that is, the area of the flexible display panel 02 adjacent to the cover 08 is a non-light-emitting area.
  • the area of the front end area 02a of the display panel outside the casing 01 is 1 light-emitting area 07 and 2 non-light-emitting areas. The sum of the areas of the area, and only one non-light-emitting area displays the picture.
  • the flexible display panel 02 may be disposed such that the area first pulled out from the outlet 06 is the light-emitting area 07, that is, the flexible display panel adjacent to the cover 08.
  • the area of 02 is the light-emitting area 07 as shown in Fig. 2C.
  • the area of the front end area 02a of the display panel 02 outside the casing 01 is one light-emitting area 07 and one non-light-emitting area.
  • the sum of the areas, and one of the light-emitting areas 07 and one of the non-light-emitting areas all display a picture, and thus the display apparatus configured according to the present example can improve the user experience as compared with the configuration of FIG. 2B.
  • the flexible display panel 02 may include an active light emitting type display panel or a passive light emitting type display panel.
  • the active light-emitting display panel may include an active matrix active light-emitting display panel, and the display panel is driven by an active matrix driving method, and each pixel in the panel has only one or two or two TFTs (Thin Film Transistor, thin film transistor). A portion of the panel can be controlled to illuminate to become a illuminating region without involving other regions on the panel.
  • the controller 04 controls, by the circuit, a plurality of pixels corresponding to the light-emitting area to emit light having a light intensity that satisfies the detection threshold of the light intensity detecting unit without affecting other areas of the display panel.
  • the shape of the light-emitting area and the non-light-emitting area may be any shape, preferably a regular shape such as a rectangle, a circle, an ellipse, a polygon, or the like.
  • the sounding detecting unit 03 determines the light-emitting area 07 detected by the light intensity detecting unit. Located at the exit 06, it is determined that the display panel area in front of the light-emitting area 07 is the front end area 02a.
  • the probe calculation unit 03 transmits the area information of the front end area 02a to the controller 04.
  • the detecting calculation unit 03 determines that the light-emitting area 07 is not at the exit.
  • the area information of the front-end area 02a detected last time is kept unchanged. For example, in the two cases shown in FIG. 3 and FIG. 4, the light-emitting area 07 is not completely aligned with the light intensity detecting unit included in the detecting unit 03, and a part of the light emitted from the light-emitting area 07 is not received by the light intensity detecting unit. And the light intensity detected by the light intensity detecting unit does not reach its detection threshold.
  • the controller 04 will not update the area size of the front end area 02a. In this way, the control precision of the controller 04 can be improved, so that the controller 04 controls the effective display area of the refresh front end area 02a only in the case where each of the light-emitting areas 07 is directly opposed to the light intensity detecting unit included in the sounding calculation unit 03. In order to ensure that the display panel 02 is pulled out from the casing 01, the front end region 02a located outside the casing 01 continuously and stably refreshes the screen.
  • the active light emitting display panel may further include a passive matrix active light emitting display panel, and the display panel is driven by a passive matrix driving method.
  • the display panel using the passive matrix driving method adopts a progressive scanning mode.
  • the detecting computing unit 03 can be disposed at a substantially central position in the width direction of the display panel 02.
  • the passive matrix driving mode of the display panel in this embodiment is modified to a column-by-column scanning mode, and the direction of the column-by-column scanning is from front to back of the display panel. direction.
  • the controller 04 can control to cause a partial column on the display panel 02 to emit light to become the light-emitting area 07 without involving other areas on the display panel.
  • the passive light emitting display panel may include a cholesteric liquid crystal display panel, and the driving manner may be either an active matrix driving or a passive matrix driving.
  • the controller 04 can control a partial area of the cholesteric liquid crystal display panel to become a reflective area, and a partial area becomes a light transmitting area.
  • the reflective area corresponds to the aforementioned light-emitting area
  • the light-transmitting area corresponds to the aforementioned non-light-emitting area
  • the reflective area is controlled in the same manner as the active matrix driving and passive matrix driving of the active light-emitting display panel.
  • the display panel 02 is a passive light-emitting display panel, and the display device further includes a light source 05 located in the housing 01.
  • a detection calculation unit 03 including a light intensity detecting unit is also disposed in the casing 01 to avoid the influence of ambient light on the detection result.
  • the light source 05 is disposed near the detection calculation unit 03. In use, the emitted light of the light source 05 does not directly enter the light intensity detecting unit, but It is shot on the display panel 02.
  • the reflection area of the display panel 02 reflects the light from the light source 05, the light transmission area of the display panel 02 transmits the light from the light source 05, the detection calculation process of the detection calculation unit 03, and the control of the controller 04 and the above-described active illumination type display panel
  • the principle is the same and will not be described here.
  • the characteristics of the cholesteric liquid crystal used in the cholesteric liquid crystal display panel are briefly introduced.
  • the state of the cholesteric liquid crystal can be divided into three forms, namely, Planar Texture (P-state), Focal Conic Texture (FC), and Vertical Weaving.
  • the cholesteric phase liquid crystal of the planar texture state (P state) has Bragg reflection characteristics and can reflect light having the same or similar wavelength as the pitch of the cholesteric liquid crystal spiral structure.
  • the cholesteric phase-type liquid crystal in the focal conic texture state (FC state) is scattered.
  • the vertical texture state (H state) cholesteric phase liquid crystal can completely transmit light.
  • Figure 8 shows the cholesteric phase when different voltages are applied.
  • the P state and the FC state can be converted to each other, and the FC state and the H state can be converted to each other, and the P state and the H state are mutually converted. Only the H state can be converted to the P state.
  • the voltage applied to the P-state liquid crystal is V P
  • the voltage applied to the FC state liquid crystal is V FC
  • V H the voltage applied to the H-state liquid crystal
  • V P> V FC P is converted to FC-state liquid crystal state of the liquid crystal, the conversion time of a few milliseconds.
  • FC-state liquid crystal conversion H-state liquid crystal which transition times of a few milliseconds rapid decrease the applied voltage V H H of the liquid crystal state, in less than 1ms of the H-state liquid crystal quickly converted into a P-state liquid crystal; while decreasing a voltage V H applied to the liquid crystal state H , in a few milliseconds, the H-state liquid crystal is rapidly converted into FC-state liquid crystal.
  • the external electric field of different strength is applied, and the state of the cholesteric liquid crystal is different, that is, the helical structure of the cholesteric liquid crystal molecule changes.
  • the display panel presents different bright or dark states.
  • the liquid crystal molecular spiral axis is substantially perpendicular to the surface of the substrate on which the pixels in the display panel are located.
  • the pitch of the structure is close to or equal to the wavelength of the incident light.
  • the controller 04 is caused to control the liquid crystal in some areas of the display panel 02 to become a planar textured liquid crystal.
  • the light from the light source 05 is irradiated on the reflection area 07, and the detection calculation unit 03 receives the light reflected by the reflection area 07 of the liquid crystal panel to determine the front end area 02a of the display panel 02. If the light source 05 is irradiated on the light transmitting area, the detection calculation unit 03 does not receive the light from the light source 05. Therefore, in the present embodiment, the function of the light transmitting region is equivalent to The function of the non-light-emitting area when the above-described active light-emitting display panel is employed.
  • the cholesteric liquid crystal has a characteristic of selectively reflecting wavelength. Accordingly, the reflection wavelength of the cholesteric liquid crystal molecules is set to ⁇ , the birefringence average value is n, and the pitch is P, then the relationship between ⁇ , n, and P is:
  • the bandwidth of the reflected wavelength is:
  • ⁇ n is the refractive index anisotropy
  • Xc is the chiral agent concentration
  • HTP is the twisting force constant of the chiral agent
  • the chiral agent concentration is determined by the properties of the chiral molecule itself.
  • the reflection wavelength ⁇ of the cholesteric liquid crystal can be adjusted by adjusting the pitch P of the liquid crystal molecules. That is, the range of wavelengths of light emitted by the light source is large. Even if the display device can include a light source that emits light of a different wavelength, by adjusting the pitch of the liquid crystal molecules in the display panel to be close to or the same as the wavelength of the light from the light source, the reflected light can be emitted, so that the detection unit 03 detects The front end area 02a is used to improve the usability of the display device.
  • the detection calculation unit 03 is disposed inside the casing 01 on the premise of satisfying the use requirement. Thereby, it is possible to prevent ambient light outside the casing 01 from interfering with the detection result of the detection calculation unit 03, preventing the detection calculation unit 03 from detecting an error and feeding back an error signal to the controller 04.
  • the controller 04 when the device is used, the controller 04 generates a small amount of heat. And because the ventilation conditions inside the casing 01 are poor, if the controller 04 is placed in the casing 01, the performance and service life of the controller 04 are affected. Therefore, the controller 04 is provided outside the casing 01.
  • the detection calculation unit determines that the display panel region in front of the Nth illumination region is the front end region.
  • the controller also controls the N+1th light-emitting areas behind the Nth light-emitting areas to emit light. In this way, the user can stretch the display panel to the desired size for viewing at any time during use.
  • the controller is configured to control at most two light emitting regions to be in a light emitting state.
  • the controller is configured to control all of the light-emitting areas on the display panel to be illuminated after the display device is powered.
  • the light-emitting area on the display panel does not perform normal screen display when in the light-emitting state, and the light-emitting area on the display panel performs normal screen display when not in the light-emitting state.
  • the display device is arranged as follows. For example, as shown in FIG. 6, when the display device is just turned on, the controller issues a signal to control the first light-emitting area 71 and the second light-emitting area 72 on the display panel 02 to emit light.
  • the detection calculation unit receives the light signal of the first light-emitting area, and determines that the area of the front end of the first light-emitting area 71 is the front-end area, and feeds back the area information of the front-end area to the controller. The controller then controls the second light-emitting area 72 to emit light.
  • the display panel 02 continues to be pulled outward from the housing 01.
  • the first illumination area 71 and the first non-emission area are located outside the casing, and the controller controls the front of the second illumination area 72.
  • the front end area redisplays the screen, the front end area includes the first light emitting area 71 and the first non-light emitting area, and the controller controls the third light emitting area to emit light. At this time, only the second light-emitting region and the third light-emitting region emit light.
  • the controller controls The front end area in front of the Nth light-emitting area N displays a picture, and the controller controls the N+1th light-emitting area N+1 to emit light. Therefore, each time the detection calculation unit 03 detects the front end area 02a and feeds back the information of the front end area 02a to the controller, the controller controls the next illumination area to emit light, and the controller is configured to emit light for at most two illumination areas.
  • the display device is set as follows. When the display device is just turned on, the controller sends a signal to control all of the light-emitting areas on the display panel to emit light. When the first light-emitting area emits light, the detection calculation unit receives the light signal of the first light-emitting area, and determines that the area in front of the first light-emitting area is the front-end area, and feeds back the area information of the front-end area to the controller. The controller then controls the display of the front end area in front of the first light-emitting area.
  • the display panel continues to be pulled out from the housing, and the detection calculation unit receives the optical signal of the second illumination area, and determines that the area in front of the second illumination area is the front end area, and the area information of the front end area is fed back to the controller, and the controller The front end area display screen in front of the second light emitting area is then controlled.
  • the controller controls the front end region display screen in front of the Nth light emitting region N, thereby simplifying the control strategy of the controller.

Abstract

一种显示装置，显示装置包括：壳体(01)，所述壳体(01)上设有出口(06)；壳体(01)内部的柔性显示面板(02)，至少部分柔性显示面板(02)可以从出口(06)拉出，在柔性显示面板(02)被拉出的情况下，位于壳体(01)外部的区域为柔性显示面板(02)的前端区域(02a)，位于壳体(01)内部的区域为柔性显示面板(02)的后端区域(02b)，从前端区域(02a)到后端区域(02b)的延伸方向为柔性显示面板(02)由前到后的方向；探测计算单元(03)，配置为探测、计算并输出前端区域(02a)的面积；控制器(04)，与探测计算单元(03)及柔性显示面板(02)通过信号连接，配置为接收探测计算单元(03)输出的前端区域(02a)的面积，并控制仅使前端区域(02a)显示画面。

Description

显示装置 技术领域
本发明涉及一种显示装置。
背景技术
目前的所谓“硬性”显示装置主要是LCD(Liquid Crystal Display，液晶显示屏)。此类显示屏不可避免地具有一定的重量和体积，并不可弯曲变形，需安置在固定的框架内，其使用便捷性受到限制。
与上述不可变形的“硬性”显示装置不同，柔性显示装置的核心部件为柔性显示面板。通常，柔性显示面板指的是一种将显示单元形成在诸如聚酰亚胺的柔性基底上而具有柔性的显示面板。因柔性显示面板具有轻薄、可弯曲变形且功耗低的特性，并且变形使之体积缩小，携带方便，因此具有巨大的应用潜能。现有的柔性显示面板一般包括壳体及卷曲在壳体内的面板，使用时将面板的一端拉出壳体进行观看。
然而，在某些情况下，柔性的显示面板只需从壳体中拉出一部分。由于此时柔性的显示面板的全部显示区域还处于有效显示的状态，因此位于壳体内部的仍处于卷曲状态的柔性的显示面板部分也为有效显示状态。此种情况下，由于位于壳体内的面板为卷曲状态，有效显示状态的卷曲的柔性面板会使壳体内部出现热堆积问题，造成壳体内部温度较高。若面板长时间处于高温条件下，则降低面板的使用性能，进而缩短面板的使用寿命。
发明内容
本发明提供一种显示装置，能够提高柔性显示面板的使用寿命。
根据一个方面，本发明的实施例一种显示装置。包括：壳体,所述壳体上设有出口；所述壳体内部的柔性显示面板，至少部分所述柔性显示面板可以从所述出口拉出，在所述柔性显示面板被拉出的情况下，位于所述壳体外部的区域为所述柔性显示面板的前端区域，位于所述壳体内部的区域为所述柔性显示面板的后端区域，从所述前端区域到所述后端区域的延伸方向为所述柔性显示面板由前到后的方向；探测计算单元，配置为探测、计算并输出所述前端区域的面积；控制器，与所述探测计算单元及所述柔性显示面板通过信号连接，配 置为接收所述探测计算单元输出的所述前端区域的面积，并控制仅使所述前端区域显示画面。
在一个示例中，所述柔性显示面板包括沿所述柔性显示面板的从前到后的方向设置的至少一个分离的标识区；所述探测计算单元包括设置于所述出口处的探测单元，且所述探测计算单元根据所述探测单元探测到标识区的数量来确定所述前端区域的面积。
在一个示例中，所述多个标识区为通过所述控制器控制而在所述柔性显示面板上形成的至少一个发光区，所述发光区和分隔所述发光区的非发光区的数量之和至少为三个；所述探测单元为光强探测单元，所述光强探测单元配置为探测光的强度。
在一个示例中，当第N个所述发光区与所述光强探测单元正对时，所述光强探测单元探测到第N个所述发光区的光信号，所述探测计算单元确定所述第N个发光区位于所述出口处，所述探测计算单元确定所述第N个发光区前方的柔性显示面板区域为所述前端区域，并将所述前端区域的面积信息反馈给所述控制器；当第N个所述非发光区与所述光强探测单元正对时，所述光强探测单元探测到与第N个所述非发光区对应的光信号，所述探测计算单元确定所述第N个非发光区位于所述出口处，所述探测计算单元保持上一次探测到的所述前端区域的面积信息不变；N为正整数。
在一个示例中，在所述柔性显示面板由前到后的方向上，所述发光区的宽度与所述非发光区的宽度相等。
在一个示例中，在所述柔性显示面板由前到后的方向上，当相接合的所述发光区的宽度与所述非发光区的宽度之和为固定值时，所述发光区的宽度小于所述非发光区的宽度。
在一个示例中，所述柔性显示面板最先从所述出口拉出的区域为发光区。
在一个示例中，所述柔性显示面板为主动发光型柔性显示面板或被动发光型柔性显示面板。
在一个示例中，所述柔性显示面板为被动发光型柔性显示面板，所述显示装置还包括设置于光强探测单元附近的光源，所述光源发射的光不直接射入所述光强探测单元，所述发光区反射来自所述光源的光，所述非发光区透射来自所述光源的光。
在一个示例中，所述柔性显示面板为逐列扫描的无源矩阵式柔性显示面 板。
在一个示例中，所述探测计算单元位于所述壳体的内部，所述控制器位于所述壳体的外部。
在一个示例中，在所述探测计算单元确定所述第N个发光区前方的柔性显示面板区域为所述前端区域时，所述控制器还控制位于所述第N个发光区后方的第N+1个所述发光区发光。
在一个示例中，所述控制器配置为控制至多两个发光区处于发光状态。
在一个示例中，所述控制器配置为位于在所述探测计算单元确定所述第N个发光区前方的柔性显示面板区域为所述前端区域时，所述控制器仅控制第N个发光区和位于所述第N个发光区后方的第N+1个所述发光区发光。
在一个示例中，所述控制器配置为在显示装置刚通电时控制所述柔性显示面板上的所有发光区处于发光状态。
使用本发明实施例提供的显示装置时，探测计算单元能够探测位于壳体外的显示面板的前端区域的面积大小，并将探测到的前端区域对应的面积信息反馈给控制器。控制器能够根据该信息仅控制显示面板的前端区域显示画面，并控制显示面板的后端区域保持原来的状态，即不显示画面，这样所述后端区域的温度较低，产生的热量很少，使得壳体内部的温度较低，因此，面板的使用性能不会受到影响或受到较小的影响，面板的使用寿命较长。
相比于现有技术，在使用过程中，上述显示装置因其位于壳体内的显示面板的后端区域为非画面显示区，该区域温度较低，产生的热量很少，壳体内部的温度也较低。因此，显示面板的后端区域卷曲在壳体内部，不会发生热堆积现象，面板的使用性能不会受热堆积现象的影响而降低，进而显示面板的使用寿命得以延长。
附图说明
为了更清楚地说明本发明实施例中的技术方案，下面将对实施例中所需要使用的附图作简单地介绍，显而易见地，下面描述中的附图仅仅是本发明的一些实施例，对于本领域普通技术人员来讲，在不付出创造性劳动的前提下，还可以根据这些附图获得其它的附图。
图1为本发明实施例提供的显示装置的示意图；
图2A-2C为图1提供的显示装置的配置状态的示意图；
图3为图1提供的显示装置的配置状态示意图；
图4为图1提供的显示装置的配置状态的示意图；
图5为本发明实施例的另一显示装置的示意图；
图6和图7为本发明实施例的显示装置的配置状态的示意图；和
图8为显示装置中的显示面板为胆甾相型液晶显示面板的情况下，所述胆甾相型液晶显示面板中的胆甾相型液晶在不同施加压力下的状态转换的示意图。
具体实施方式
下面将结合本公开实施例中的附图，对本公开实施例中的技术方案进行清楚、完整地描述，显然，所描述的实施例仅仅是本公开一部分实施例，而不是全部的实施例。基于本公开中的实施例，本领域普通技术人员在没有作出创造性劳动前提下所获得的所有其他实施例，都属于本公开保护的范围。
除非另作定义，此处使用的技术术语或者科学术语应当为本公开所属领域内具有一般技能的人士所理解的通常意义。本公开专利申请说明书以及权利要求书中使用的“第一”、“第二”以及类似的词语并不表示任何顺序、数量或者重要性，而只是用来区分不同的组成部分。同样，“一个”或者“一”等类似词语也不表示数量限制，而是表示存在至少一个。“连接”或者“相连”等类似的词语并非限定于物理的或者机械的连接，而是可以包括电性的连接，不管是直接的还是间接的。“上”、“下”、“左”、“右”等仅用于表示相对位置关系，当被描述对象的绝对位置改变后，则该相对位置关系也相应地改变。附图中各层膜层的厚度和形状不反映真实比例，目的只是示意说明本发明内容。
图1为本发明的第一实施例提供的显示装置。如图1所示，该显示装置包括壳体01及位于壳体01内部的柔性显示面板02。壳体01可以为具有不同几何形状的箱体，箱体上可设置有通风的开口。柔性显示面板02为形成在柔性基底上而可经受卷曲变形仍可实现显示功能的显示面板。在不使用的状态，柔性显示面板02处于卷绕状态。壳体01上设有出口06。在使用的状态，显示面板02从出口06拉出。如图1所示，一部分的柔性显示面板02从壳体01拉出。在该状态，位于壳体02外部的区域为柔性显示面板02的前端区域02a，位于壳体01内部的区域为柔性显示面板02的后端区域02b，从前端区域02a到后端区域02b的延伸方向为柔性显示面板由前到后的方向。前端区域02a的与后 端区域02b相对的一段与盖体08连接。柔性显示面板02被拉出的方向为显示面板02的长度方向即行方向，而与该拉出方向垂直的方向为显示面板02的宽度方向即列方向。
上述显示装置还包括探测计算单元03及控制器04。探测计算单元03探测并计算前端区域02a的面积大小，并将前端区域02a的面积大小输出给控制器04。控制器04与探测计算单元03及显示面板02通过信号连接，接收探测计算单元03输出的前端区域02a的面积大小，并控制仅使前端区域02a处于有效显示状态，即显示画面。
使用本发明的第一实施例提供的显示装置时，探测计算单元03能够探测位于壳体01外的柔性显示面板02的前端区域02a的面积大小，并将探测到的前端区域02a对应的面积信息输出给控制器03。控制器03根据该信息仅控制柔性显示面板02的前端区域02a显示画面，并控制柔性显示面板02的后端区域02b处于不显示画面的状态。这样后端区域02b的温度较低，产生的热量很少，使得壳体01内部的温度较低。因此，柔性显示面板02的使用性能不会受到影响或受到较小的影响，柔性显示面板02的使用寿命较长。
在上述显示装置的使用过程中，因其位于壳体内的柔性显示面板02的后端区域不显示画面，该区域温度较低，产生的热量很少，壳体内部的温度也较低。因此，即使柔性显示面板的后端区域卷曲在壳体内部，不会发生热堆积现象。柔性显示面板的使用性能不会受热堆积现象的影响而降低，进而柔性显示面板的使用寿命得以延长。
在上述的实施例中，控制器与探测计算单元及显示面板通过信号连接。此处“信号连接”包括通过信号线连接和通过无线信号连接。
基于上述显示装置，为使探测计算单元能够实现探测前端区域的面积，使用时，使所述控制器控制在显示面板上形成沿由前端区域到后端区域的方向间隔排列的用于信号检测的标识区(例如发光区)和非标识区(例如非发光区)。所述标识区和所述非标识区的数量之和至少为三个。即在本实施例中，将显示面板上形成的发光区作为标识区，从而探测计算单元通过探测发光区来确定前端区域面积大小。前端区域的面积大小主要依据探测计算单元探测到的发光区的数量来确定。
需明确说明的是，本实施例中的发光区是用于探测计算单元进行信号检测的，不进行正常的画面显示。本实施例中的发光区包括主动发光的发光区，和 在光源照射下被动发光的反射型发光区。对应地，本实施例中的非发光区包括分隔主动发光的发光区的非发光区，和间隔被动发光的反射型发光区的透光区。
探测计算单元通过探测发光区的数量确定前端区域的面积。而非发光区划分发光区，使发光区成为间隔有预定距离的多个离散区域。具体地，如图2A所示，探测计算单元03包括设置于出口06处的光强探测单元(未显示)。光强探测单元探测光的强度。光强探测单元可位于壳体01内，或位于壳体01外。当一个发光区07与光强探测单元正对时，光强探测单元探测到该发光区07的光信号，由此探测计算单元03确定发光区07位于出口06处。探测计算单元03确定该发光区07前方的显示面区域为前端区域。此时，该前端区域不包括发光区07本身。将该前端区域的面积信息反馈给控制器(未显示)。当柔性显示面板02被进一步拉出，从而与发光区07相邻且位于后方的非发光区与光强探测单元正对时，光强探测单元探测到与该非发光区对应的光信号，由此探测计算单元03保持上一次探测到的所述前端区域的面积信息不变。
在本实施例中，发光区可设置为多个间隔预定距离的离散区域，即柔性显示面板02包括了多个位置不同的发光区07，便于区分被拉出壳体01的显示面板的前端区域02a的不同大小。位于柔性显示面板02上的不同位置的发光区07指示不同大小的前端区域02a，不同大小的前端区域02a继而对应不同的前端区域02a的面积信息。探测计算单元03通过探测位于显示面板上的不同位置的发光区来获取不同的前端区域面积信息。在每一次探测之后，探测计算单元03将前端区域02a的面积信息输出给控制器；而控制器每一次接收到来自探测计算单元03的前端区域02a的面积信息后，会根据不同的前端区域02a的面积信息控制对应的前端区域02a中的像素显示画面。该前端区域02a可显示比例缩小完整画面或完整画面的部分画面；与此同时，控制器控制后端区域02b保持原有状态，即不显示画面。而作为非画面显示区域的后端区域02a温度较低，产生的热量很少，使得壳体01内部的温度也较低。
在本申请的实施例中，可在柔性显示面板上形成指示前端区域02a的面积的其他类型区域或者结构，此处不再赘述。
在本实施例中，为使控制器04的控制策略较为简便化，在柔性显示面板的拉出的方向上，发光区07的宽度与非发光区的宽度相等。
在某些情况下，如图2B所示，由于空间限制，柔性显示面板02被从壳体 01的出口06拉出后，柔性显示面板02上的一个发光区07位于壳体01外。与该发光区07紧邻的非发光区位于出口06处并与光强探测单元正对时。所述光强探测单元探测到与该非发光区对应的光信号。此时探测计算单元03保持上一次探测到的所述前端区域的面积信息不变，即控制器此时不会控制来刷新扩大后的前端区域02a的有效显示区域。因此位于壳体01外的距离出口06最近的发光区07不显示画面。为提高用户体验，应尽量使这一不显示画面的发光区07的宽度小一些。本实施例中，为达到此目的，在柔性显示面板02的拉出方向上，在相邻的发光区07的宽度与非发光区的宽度之和为固定值的情况下，使发光区07的宽度小于非发光区的宽度。如此，位于壳体01外部的柔性显示面板02上的非有效显示区域就会相对较小，用户体验得以提高。在本实施例中，柔性显示面板02设置为最先从所述出口06拉出的区域为非发光区，即与盖体08相邻的柔性显示面板02的区域为非发光区。在柔性显示面板02被进一步拉出而使得第2个发光区07正对光强探测单元之前，位于壳体01外的显示面板的前端区域02a的面积为1个发光区07和2个非发光区的面积之和，而仅一个非发光区显示画面。
为进一步提高用户体验，在本实施例的另一示例中，柔性显示面板02可设置为最先从所述出口06拉出的区域为发光区07，即与盖体08相邻的柔性显示面板02的区域为发光区07，如图2C所示。在该实施例中，在第2个发光区07正对光强探测单元的状态，位于壳体01外的显示面板02的前端区域02a的面积为1个发光区07和1个非发光区的面积之和，且1个发光区07和1个非发光区均显示画面，因此与图2B的配置相比按照本示例配置的显示装置能够提高用户体验。
在上述的实施例中，柔性显示面板02可包括主动发光型显示面板或被动发光型显示面板。
具体的，主动发光型显示面板可包括有源矩阵式主动发光型显示面板，该种显示面板采用有源矩阵驱动方式进行驱动，面板中的每一个像素只有1个或2-3个TFT(Thin Film Transistor，薄膜晶体管)。可控制该面板的部分区域发光而成为发光区域，而不涉及面板上的其他区域。比如在本实施例中，控制器04通过电路控制与发光区对应的多个像素发射具有满足所述光强探测单元探测阈值的光强的光，而不影响显示面板的其他区域。发光区和非发光区的形状可以为任意形状，优选为规则形状，比如矩形、圆形、椭圆形及多边形等等。 在光强探测单元探测到的由发光区中的多个像素所发射的光的光强达到光强探测单元的探测阈值的情况下，探测计算单元03确定光强探测单元探测到的发光区07位于出口06处，并确定该发光区07前方的显示面板区域为前端区域02a。探测计算单元03将前端区域02a的面积信息发送给控制器04。而在光强探测单元探测到的由发光区07的多个像素所发射的光的光强未达到光强探测单元的探测阈值的情况下，探测计算单元03则确定发光区07并未处于出口06处，因此保持上一次探测到的前端区域02a的面积信息不变。比如，在如图3和图4所示的两种情况中，发光区07未完全对准探测计算单元03包括的光强探测单元，发光区07的发出的一部分光未被光强探测单元接收，且光强探测单元探测到的光强未达到其探测阈值。此时，控制器04将不会更新前端区域02a的面积大小。这样，可提高控制器04的控制精度，从而仅在每一个发光区07与探测计算单元03所包括的光强探测单元正对的情况下，控制器04才控制刷新前端区域02a的有效显示区域，以保证显示面板02从壳体01拉出的过程中，位于壳体01外部的前端区域02a持续而稳定地刷新画面。
作为一种可选且优选的方式，主动发光型显示面板还可包括无源矩阵式主动发光型显示面板，该种显示面板采用无源矩阵驱动方式进行驱动。通常情况下，采用无源矩阵驱动方式的显示面板采用逐行扫描的方式在本发明的实施例中，探测计算单元03可设在与显示面板02的宽度方向上的大致中央位置。为保证探测计算单元03能够探测到每个发光区07，本实施例中显示面板的无源矩阵驱动方式修改为逐列扫描方式，且该逐列扫描的方向为从显示面板的从前到后的方向。控制器04可控制使显示面板02上的部分列发光，成为发光区07，而不涉及显示面板上的其他区域。
在本发明的实施例中，被动发光型的显示面板可包括胆甾相型液晶显示面板，其驱动方式既可以为有源矩阵驱动，也可以为无源矩阵驱动。在使用时，控制器04可控制胆甾相型液晶显示面板的部分区域成为反射区，部分区域成为透光区。此时，所述反射区相当于前述的发光区，所述透光区相当于前述的非发光区，其反射区的控制方式与主动发光型显示面板的有源矩阵驱动和无源矩阵驱动相同。如图5所示，显示面板02为被动发光型显示面板，显示装置还包括位于壳体01内的光源05。包括光强探测单元的探测计算单元03也设置于壳体01内，以避免环境光对于探测结果的影响。光源05设置于探测计算单元03附近。在使用中，光源05的发出光不会直接射入光强探测单元，而是照 射到显示面板02上。显示面板02的反射区反射来自光源05的光，显示面板02的透光区透射来自光源05的光，探测计算单元03的探测计算过程及控制器04的控制与上述采用主动发光型显示面板的原理一致，此处不做赘述。
在此针对胆甾相型液晶显示面板采用的胆甾相液晶所具有的特性做简单介绍。依据施加电压的不同，胆甾相型液晶的状态可分为三种形式，即平面织构态(Planar Texture，P态)、焦锥织构态((Focal Conic Texture，FC态)及垂直织构态(Homeotropic Texture，H态)。平面织构态(P态)的胆甾相型液晶具有布拉格(Bragg)反射特性，能够反射波长与胆甾相型液晶螺旋结构的螺距相同或相近的光。焦锥织构态(FC态)的胆甾相型液晶呈散射状态。垂直织构态(H态)胆甾相型液晶可以完全透射光线。图8为施加不同电压时，胆甾相型液晶在P态、FC态及H态之间的转换图。如图8所示，P态和FC态之间可以互相转换，FC态和H态之间可以互相转换，而P态和H态之间只能由H态向P态转换。具体地，设定向P态液晶施加的电压为VP，向FC态液晶施加的电压为VFC，向H态液晶施加的电压为VH。当VP＞VFC时，P态液晶转换为FC态液晶，其转换时间为几毫秒。当VFC＞VH时，FC态液晶转换为H态液晶，其转换时间也为几毫秒。快速降低H态液晶的施加电压VH，在不到1ms的时间内H态液晶迅速转换为P态液晶；而缓慢降低H态液晶的施加电压VH，在几毫秒的时间内，H态液晶迅速转换为FC态液晶。综上，施加不同强度的外电场，胆甾相型液晶的状态不同，即胆甾相液晶分子的螺旋结构发生改变而显示面板呈现不同的亮或暗的状态。特别地，当胆甾相型液晶处于P态时，液晶分子螺旋轴与显示面板中像素所在的基板表面基本都是垂直的，此时，若液晶螺旋结构的螺距与入射光的波长相近或相等，满足布拉格反射条件，则该波长的入射光会被反射，即平面织构态(P态)具有的布拉格(Bragg)反射特性。
在本实施例中，在显示面板02为胆甾相型液晶显示面板的情况下，在使用中，使控制器04控制显示面板02中某些区域中的液晶成为平面织构态液晶，则所述区域成为反射区，而控制用于间隔所述反射区域的其他区域中的液晶成为垂直织构态液晶，即所述其他区域成为透射区。来自光源05的光照射在反射区07上，探测计算单元03接受液晶面板的反射区07反射的光线而确定显示面板02的前端区域02a。如果来自光源05照射在透光区上，则探测计算单元03接收不到来自光源05的光。因此，在本实施例中，透光区的功能相当于 采用上述主动发光型显示面板时的非发光区的功能。
胆甾相型液晶具有选择性反射波长的特性。据此，设定胆甾相液晶分子的反射波长为λ，双折射率平均值为n，螺距为P，则λ、n、P之间的关系为：
λ＝n×P
进一步地，反射波长的带宽是：
Δλ＝Δn×P
其中，Δn为折射率各向异性，螺距为P＝1/(HTP×Xc)，Xc为手性剂浓度，HTP是手性剂的扭曲力常数，手性剂浓度和手性剂扭曲力常数由手性分子自身的特性决定。
依据上述公式可知，在包括胆甾相型液晶显示面板的本实施例中，可以通过调节液晶分子的螺距P来调节胆甾相型液晶的反射波长λ。即光源发射的光的波长范围较大。即使显示装置可包括发射不同波长的光的光源，通过调节显示面板中液晶分子的螺距，使之与来自光源的光的波长相近或相同，即能够实现反射区发射光线，从而探测计算单元03探测到前端区域02a，提高所述显示装置的实用性。
优选地，为便于携带，在满足使用要求的前提下，将探测计算单元03设置于壳体01的内部。由此，可防止壳体01外的环境光线干扰探测计算单元03的探测结果，防止探测计算单元03探测错误并向控制器04反馈错误信号。然而，使用该装置时，控制器04会有少量的热量产生。且因为壳体01内部的通风条件较差，如果将控制器04放置在壳体01内，则会影响控制器04的使用性能及使用寿命。因此将控制器04设于壳体01的外部。
进一步地，为使探测计算单元探测并确定显示面板的前端区域及控制器控制该前端区域显示面面的过程能够持续进行，在探测计算单元确定第N个发光区前方的显示面板区域为前端区域的同时，控制器还控制在所述第N各发光区后方的第N+1个发光区发光。如此，使用时使用者可随时将显示面板拉伸至所需尺寸进行观看。
优选地，在所述显示装置中，所述控制器配置为控制至多两个发光区处于发光状态。或者，为简化控制器的执行步骤，控制器配置为在显示装置通电后，控制显示面板上的所有发光区处于发光状态。这里，如前所述，显示面板上的发光区在处于发光状态时不进行正常的画面显示，而显示面板上的发光区在不处于发光状态时进行正常的画面显示。
若控制器控制至多两个发光区处于发光状态，则所述显示装置如下设置。例如，如图6所示，当上述显示装置刚打开时，控制器发出信号，控制显示面板02上的第1发光区71和第2发光区72发光。由于当第1发光区71发光时，探测计算单元接受第1发光区的光信号，并确定第1个发光区71前端的区域为前端区域，同时将该前端区域的面积信息反馈给控制器。控制器随即控制第2发光区72发光。显示面板02继续从壳体01往外拉，当第2发光区72对准探测计算单元03时，第1发光区71和第1非发光区位于外壳外，控制器控制第2发光区72的前方的前端区域重新显示画面，该前端区域包括第1发光区71和第1非发光区，且控制器控制第3发光区发光。这时，仅第2发光区和第3发光区发光。以此类推，如图7所示，当第N发光区N对准探测计算单元03时，第N-1发光区N-1和第N-1非发光区被拉出外壳01，控制器控制第N发光区N前方的前端区域显示画面，且控制器控制第N+1发光区N+1发光。因此，探测计算单元03每次探测前端区域02a并将该前端区域02a的信息反馈给控制器后，控制器控制下一个发光区发光，且控制器配置为至多两个发光区发光。
若控制器控制显示面板上的所有发光区均处于发光状态，则所述显示装置如下设置。当上述显示装置刚通电打开时，控制器发出信号，控制显示面板上的所有发光区均发光。当第1发光区发光时，探测计算单元接受第1发光区的光信号，并确定第1个发光区前方的区域为前端区域，同时将该前端区域的面积信息反馈给控制器。控制器随即控制第1发光区前方的前端区域显示画面。显示面板继续从壳体往外拉，探测计算单元接受第2发光区的光信号，并确定第2个发光区前方的区域为前端区域，同时将该前端区域的面积信息反馈给控制器，控制器随即控制第2发光区前方的前端区域显示画面。如此，当第N发光区N对准探测计算单元时，控制器控制第N发光区N前方的前端区域显示画面，以此可以简化控制器的控制策略。
以上实施方式仅用于说明本公开，而并非对本公开的限制，有关技术领域的普通技术人员，在不脱离本公开的精神和范围的情况下，还可以做出各种变化和变型，因此所有等同的技术方案也属于本公开的范畴，本公开的专利保护范围应由权利要求限定。

Claims (15)

  1. 一种显示装置，包括：
    壳体,所述壳体上设有出口；
    所述壳体内部的柔性显示面板，至少部分所述柔性显示面板可以从所述出口拉出，在所述柔性显示面板被拉出的情况下，位于所述壳体外部的区域为所述柔性显示面板的前端区域，位于所述壳体内部的区域为所述柔性显示面板的后端区域，从所述前端区域到所述后端区域的延伸方向为所述柔性显示面板由前到后的方向；
    探测计算单元，配置为探测、计算并输出所述前端区域的面积；
    控制器，与所述探测计算单元及所述柔性显示面板通过信号连接，配置为接收所述探测计算单元输出的所述前端区域的面积，并控制仅使所述前端区域显示画面。
  2. 根据权利要求1所述的显示装置，其中
    所述柔性显示面板包括沿所述柔性显示面板的从前到后的方向设置的至少一个的分离的标识区；
    所述探测计算单元包括设置于所述出口处的探测单元，且所述探测计算单元根据所述探测单元探测到标识区的数量来确定所述前端区域的面积。
  3. 根据权利要求2所述的显示装置，其中，所述多个标识区为通过所述控制器控制而在所述柔性显示面板上形成的至少一个发光区，所述发光区和分隔所述发光区的非发光区的数量之和至少为三个；
    所述探测单元为光强探测单元，所述光强探测单元配置为探测光的强度。
  4. 根据权利要求3所述的显示装置，其中，当第N个所述发光区与所述光强探测单元正对时，所述光强探测单元探测到第N个所述发光区的光信号，所述探测计算单元确定所述第N个发光区位于所述出口处，所述探测计算单元确定所述第N个发光区前方的柔性显示面板区域为所述前端区域，并将所述前端区域的面积信息反馈给所述控制器；
    当第N个所述非发光区与所述光强探测单元正对时，所述光强探测单元探测到与第N个所述非发光区对应的光信号，所述探测计算单元确定所述第N个非发光区位于所述出口处，所述探测计算单元保持上一次探测到的所述前端区域的面积信息不变；
    N为正整数。
  5. 根据权利要求3或4所述的显示装置，其中，在所述柔性显示面板由前到后的方向上，所述发光区的宽度与所述非发光区的宽度相等。
  6. 根据权利要求3或4所述的显示装置，其中，在所述柔性显示面板由前到后的方向上，当相接合的所述发光区的宽度与所述非发光区的宽度之和为固定值时，所述发光区的宽度小于所述非发光区的宽度。
  7. 根据权利要求3或4所述的显示装置，其中，所述柔性显示面板最先从所述出口拉出的区域为发光区。
  8. 根据权利要求3或4所述的显示装置，其中，所述柔性显示面板为主动发光型柔性显示面板或被动发光型柔性显示面板。
  9. 根据权利要求8所述的显示装置，其中，所述柔性显示面板为被动发光型柔性显示面板，所述显示装置还包括设置于光强探测单元附近的光源，所述光源发射的光不直接射入所述光强探测单元，所述发光区反射来自所述光源的光，所述非发光区透射来自所述光源的光。
  10. 根据权利要求3或4所述的显示装置，其中，所述柔性显示面板为逐列扫描的无源矩阵式柔性显示面板。
  11. 根据权利要求1-10任一项所述的显示装置，其中，所述探测计算单元位于所述壳体的内部，所述控制器位于所述壳体的外部。
  12. 根据权利要求3-11所述的显示装置，其中，在所述探测计算单元确定所述第N个发光区前方的柔性显示面板区域为所述前端区域时，所述控制器还控制位于所述第N个发光区后方的第N+1个所述发光区发光。
  13. 根据权利要求12所述的显示装置，其中，所述控制器配置为控制至多两个发光区处于发光状态。
  14. 根据权利要求13所述的显示装置，其中，所述控制器配置为位于在所述探测计算单元确定所述第N个发光区前方的柔性显示面板区域为所述前端区域时，所述控制器仅控制第N个发光区和位于所述第N个发光区后方的第N+1个所述发光区发光。
  15. 根据权利要求12所述的显示装置，其中，所述控制器配置为在显示装置刚通电时控制所述柔性显示面板上的所有发光区处于发光状态。
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